refactor: use ajv instead of cafy (#8324)

* wip

* wip

* Update abuse-user-reports.ts

* Update files.ts

* Update list-remote.ts

* Update list.ts

* Update show-users.ts

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* Update update.ts

* Update search.ts

* Update reactions.ts

* Update search.ts

* wip

* wip

* wip

* wip

* Update update.ts

* Update relation.ts

* Update available.ts

* wip

* wip

* wip

* Update packages/backend/src/server/api/define.ts

Co-authored-by: Johann150 <johann.galle@protonmail.com>

* Update define.ts

* Update define.ts

* typo

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* Update update.ts

* wip

* Update signup.ts

* Update call.ts

* minimum for limit

* type

* remove needless annotation

* wip

* Update signup.ts

* wip

* wip

* fix

* Update create.ts

Co-authored-by: Johann150 <johann.galle@protonmail.com>

packages/backend/src/server/api/endpoints/users/relation.ts

@@ -1,6 +1,4 @@
-import $ from 'cafy';
 import define from '../../define';
-import { ID } from '@/misc/cafy-id';
 import { Users } from '@/models/index';
 
 export const meta = {
@@ -8,12 +6,6 @@ export const meta = {
 
 	requireCredential: true,
 
-	params: {
-		userId: {
-			validator: $.either($.type(ID), $.arr($.type(ID)).unique()),
-		},
-	},
-
 	res: {
 		optional: false, nullable: false,
 		oneOf: [
@@ -101,8 +93,24 @@ export const meta = {
 	},
 } as const;
 
+const paramDef = {
+	type: 'object',
+	properties: {
+		userId: {
+			anyOf: [
+				{ type: 'string', format: 'misskey:id' },
+				{
+					type: 'array',
+					items: { type: 'string', format: 'misskey:id' },
+				},
+			],
+		},
+	},
+	required: ['userId'],
+} as const;
+
 // eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
+export default define(meta, paramDef, async (ps, me) => {
 	const ids = Array.isArray(ps.userId) ? ps.userId : [ps.userId];
 
 	const relations = await Promise.all(ids.map(id => Users.getRelation(me.id, id)));